Piebald,
Correction they are listed as Genova Insert Plugs ($0.66). Lowes: Item # 54540 Model # 351827 These will keep the dirt from plugging the end of the poles.
Attachment 168783
Smart design sometimes comes through dumb luck . Most people want to cut at the mid point on the pole, however, for this design that would place the weakest joint at the highest load point.
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